报错：“unsupported operand type(s) for -: 'list' and 'int'”
以下为报错的代码，
我以为是列表和数字不能进行运算，所以把他拿出来单独拿出来之后确认没有其他问题的情况下又用不同方法测试了几次成绩始终不理想 = =l。
orz orz orz

class Glass(pygame.sprite.Sprite):
def init(self, glass_image, bg_size = (800, 600)):

初始化动画精灵

    pygame.sprite.Sprite.__init__(self)

    self.glass_image = pygame.image.load(glass_image).convert_alpha()
    self.glass_rect = self.glass_image.get_rect()
    self.glass_rect.left, self.glass_rect.top = (bg_size[0] - self.glass_rect.width) // 2, (bg_size - self.glass_rect.height) // 2

glass = Glass(glass_image, bg_size)

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